linux-kernel - RE: [PATCH] ep93xx: Implement double buffering for M2M DMA channels

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Message-ID: <ADE657CA350FB648AAC2C43247A983F00206987A3E66@AUSP01VMBX24.collaborationhost.net>
Date:	Tue, 17 Apr 2012 10:46:28 -0500
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	Rafal Prylowski <prylowski@...asoft.pl>
CC:	Mika Westerberg <mika.westerberg@....fi>,
	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"rmallon@...il.com" <rmallon@...il.com>
Subject: RE: [PATCH] ep93xx: Implement double buffering for M2M DMA channels

On Tuesday, April 17, 2012 12:16 AM, Rafal Prylowski wrote:
> On 2012-04-16 20:59, H Hartley Sweeten wrote:
>> It appears your patch is causing an interrupt storm on my system.
>> 
>
> Could you please apply the following patch on top of double buffering
> patch? I would like to know the state of dma channel when you get
> that interrupt storm.

Rafal,

Here's the output:

mmc_spi spi0.1: SD/MMC host mmc0, no poweroff
M2M: 20c3
M2M: 20c3
M2M: 21c3
M2M: 21c3
M2M: 21c3
M2M: 21c3
M2M: 21c3
M2M: 21c3

The "M2M: 21c3" keeps getting output until the system is turned off.

Regards,
Hartley
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